apply one textures to others
As part of the same mesh, it would be very dificult, but you can separate the leafts into individual objects, that way you can put the same texture to all of them.

In order to do so, you must select all the leafts whit A and then Press P and choose by Loose Parts. then you can asing the same material to all the individual leafts. 

It should be posible to use unwrap and uv textures to return them to the same object, but i'm  not so sure, so lets keep it that way, good luck.